"FUKUSHIMA, Japan – Operators evacuated workers from Japan's tsunami-damaged nuclear plant Monday after gray smoke rose from one of its reactor units, the latest of persistent troubles in stabilizing the radiation-leaking complex.

The evacuation brought to a standstill some of the work on restoring the plant's electrical lines and restarting the water pumping systems needed to keep nuclear fuel from overheating and releasing even greater amounts of radiation.

Tokyo Electric Power Co. spokesman Hiroshi Aizawa said the evacuation was prompted by smoke rising from the area of the spent fuel storage pool at the plant's Unit 3 reactor building. However, nuclear safety agency official Hidehiko Nishiyama later told reporters in Tokyo he didn't think the smoke was linked to the fuel pool."